Aldridge / Eldridge connections

Hello.I am relatively new to doing this type of research and I've come across a very confusing puzzle.My family name is Eldridge, descended from Eldred, but have learned that the name has been changed various times to Aldridge, Aldred, Aldredge, Aldrich, Eldredge, Eldrich, and who knows what else.Have any of you come across this spelling variance?

My modern ancestors can't even trace my great great grandparents.So I'm just trying to locate countries of origin.I'm aware of England, but have caught hints of Scotland and Ireland as well.Any help would be appreciated.